'A' - Alluminium '2X' - XLPE Insulation 'F' - Steel Strip Armour 'y' - PVC Insulation 'W' - Steel Round Wire Armour 'y' - PVC Outer Sheeth 'ww' - Steel Double round wire armour 'yy' - Steel Double Strip Armour 'Wa' - Non Magnetic round wire armour 'Fa' - Non Magnetic flat strip armour L - FRLS Outer Sheath CWZ - Fire Survival (FS) Cable Specs as per BS6387 (C - Fire Resistance to 950 Deg C; W - Resistance to fire with water; Z - Resistance to Fire with mechanical Shock) AYFY Means Alluminum PVC Insulated Fltat strip armour and PVC outer sheath cable